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There is a definite mathematical relationship between the ratio of the amount of daughter product isotope to the amount of radioactive parent isotope, and the number of half-lives that have elapsed.
The relationship is non-linear, involving a logarithmic function.
D/P is just the ratio of the amount of daughter product isotope to the amount of radioactive parent isotope.
Some formations of rock younger than Paleozoic, also not widespread in Grand Canyon, are not included here. There is a major nonconformity, a major angular unconformity and a major disconformity. Below is a stratigraphic sequence for the the Grand Canyon in the form of a table.You can use principles of relative geologic age to determine sequences of geologic events, including rock formations, intervals of erosion, tilting, folding, and faulting like those represented in the block diagrams and cross-sections below.Be sure to review the principles of relative geologic age on the Geologic Time Basics page .The table below tracks the decay, half-life by half-life, of a radioactive isotope, and the accumulation of the daughter product isotope that the parent changes into once it decays. There are several different radioactive isotope systems that are used for measuring ages of geologic materials.For more information on these systems, see the isotopes and half-lives section of the Geologic Time Basics page.